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CVE.org (no NVD analysis yet)· CNA Go

CVE-2026-78661: Avoid quadratic complexity when coalescing text nodes in html in golang.org/x/net

HighCVSS 7.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.40% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: golang.org/x/net golang.org/x/net/html 0.62.0; azl3 application-gateway-kubernetes-ingress 1.7.7-6 on Azure Linux 3.0 Release Notes; azl3 application-gateway-kubernetes-ingress 1.7.7-7 on Azure Linux 3.0 1.7.7-8.

Low priority for now. Upgrade to golang.org/x/net golang.org/x/net/html 0.62.0; azl3 application-gateway-kubernetes-ingress 1.7.7-6 on Azure Linux 3.0 Release Notes; azl3 application-gateway-kubernetes-ingress 1.7.7-7 on Azure Linux 3.0 1.7.7-8 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

When coalescing adjacent text nodes in addText and fosterParent, appending to an existing TextNode's Data via string concatenation (n.Data += text) reallocated and copied the accumulated string on every token. Inputs containing many short text runs separated by ignored end tags (such as "a</x>") caused O(n^2) allocations and byte copies. Accumulate coalesced text in per-node byte slices during parsing and materialize Data strings once at the end of parse.

Published
Oct 27, 2026
Updated
Nov 4, 2026
EPSS
0.4% · 35th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Go). Independent of NVD's CPE analysis and usually ahead of it.

  • golang.org/x/net golang.org/x/net/html

    • before 0.62.0affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12golang-golang-x-netfrom 0—
Debian:14golang-golang-x-netbefore 1:0.62.0-11:0.62.0-1
Gogolang.org/x/netbefore 0.62.00.62.0
openSUSE:Tumbleweedamazon-cloudwatch-agentbefore 1.300074.0-1.11.300074.0-1.1
openSUSE:Tumbleweedgoogle-osconfig-agentbefore 20261103.02-1.120261103.02-1.1

Same product

Other highest-scoring records for the same primary product.

  • CVE-2025-22872Incorrect Neutralization of Input During Web Page Generation in x/net in golang.org/x/net
    26Monitor
  • CVE-2026-97045Check all ancestor namespace transitions when rendering raw text in html in golang.org/x/net
    24Monitor
  • CVE-2024-45338Non-linear parsing of case-insensitive content in golang.org/x/net/html
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
golang.org/x/net golang.org/x/net/html0.62.0Vendor (CNA)
azl3 application-gateway-kubernetes-ingress 1.7.7-6 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 application-gateway-kubernetes-ingress 1.7.7-7 on Azure Linux 3.01.7.7-8 · Release NotesMicrosoft (MSRC)
azl3 cert-manager 1.12.15-15 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 cf-cli 8.7.11-10 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 cloud-provider-kubevirt 0.5.1-10 on Azure Linux 3.00.5.1-11 · Release NotesMicrosoft (MSRC)
azl3 cri-tools 1.32.0-10 on Azure Linux 3.01.32.0-11 · Release NotesMicrosoft (MSRC)
azl3 dasel 2.8.1-5 on Azure Linux 3.02.8.1-6 · Release NotesMicrosoft (MSRC)
azl3 docker-buildx 0.14.0-19 on Azure Linux 3.00.14.0-20 · Release NotesMicrosoft (MSRC)
azl3 docker-compose 2.27.0-16 on Azure Linux 3.02.27.0-17 · Release NotesMicrosoft (MSRC)
azl3 gh 2.102.0-2 on Azure Linux 3.02.102.0-3 · Release NotesMicrosoft (MSRC)
azl3 influxdb 2.7.5-22 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 influxdb 2.7.5-23 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kube-vip-cloud-provider 0.0.10-11 on Azure Linux 3.00.0.10-12 · Release NotesMicrosoft (MSRC)
azl3 kubevirt 1.8.4-4 on Azure Linux 3.01.8.4-5 · Release NotesMicrosoft (MSRC)
azl3 packer 1.9.5-23 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 sriov-network-device-plugin 3.7.0-9 on Azure Linux 3.03.7.0-10 · Release NotesMicrosoft (MSRC)
azl3 telegraf 1.31.0-35 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 telegraf 1.31.0-36 on Azure Linux 3.01.31.0-37 · Release NotesMicrosoft (MSRC)
debian:golang-golang-x-net1:0.62.0-1 · Debian:14Package registry (OSV)
Go:golang.org/x/net0.62.0Package registry (OSV)
opensuse:amazon-cloudwatch-agent1.300074.0-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:google-osconfig-agent20261103.02-1.1 · openSUSE:TumbleweedPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 13, 2026+16 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Not on record for this CVE: patch commit or PR link · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-407 · Inefficient Algorithmic Complexity

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. CVSS— → 7.5
  2. Severity— → high
  3. SSVC exploitation— → none
  4. Exploit maturity— → none
  5. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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